I am experiencing this same issue. I recently changed phones and am now encountering the same problem you are having. I even completely wiped my previous phone, so I am unsure why this is happening. When I log into my Evernote app on my new phone, I can use it for like 10 seconds then a screen pops up that says, "Upgrade to continue using Evernote on this device." Initially, I followed the instructions to Unsync a Device but kept getting the same prompt repeatedly. Now, when I do try to Unsync a Device, it gives me the same screen you are receiving. I'm really frustrated because I relied on Evernote for a lot of things.